Distributing-valve.



PATBNTED MAR. 10, 1908.v H. LENTZ 61W. von?. l

DISTRIBUTING VALVE. APPLICATION ruim) DB0. 19, 1906.

A TTO/P/I/ff/s 'UNITE-,n STATES Parmi* HUGOLENTZ, OF HALENSEE, NEARBERLIN, AND WILHELM VOIT, OFBERLIN-STEGLITZ,

i GERMANY.

DIsrmBUTING-VALVE.

Specification of Letters Patent. Patented March 10, 190B.

Application filed December 19, 1906. Serial No. 348,521.

" To all whom it may concern:

,have invented certain new and useful Improvements in and Relating toDistributing# alves, of which the following is a specification.

This invention has for its object a form of double seat distributingvalve for steam or other motors.

The invention is Vcharacterivied by the fact that the double seattubular valve of' known form is combined with a hollow rod forming onewith it and prolonged on both sides of the valve for the specialpurposes of improving the control, of facilitating the evacuation of theoil, of the products of condensation and other substances contained bothin the box of the spring loading the valve and in the distributing chestand at the same time effecting the lubrication of the distributingmechanism.

The invention also provides a practical solution of the application Aofdistributing gears with horizontally arranged valves.

In the accompanying drawing. Figure 1 is a longitudinal section throughthe device as a whole on the axis of the valve rod. Fig. la-is a planview of a detail of Fig. 1. Fig. 2 is an external elevation of the valvewith its hollow rod. Fig. 3 illustrates a modified construction of thevalve. The double seat valve a is made in one piece with its ,valve rodb c which is hollow throughout its length. It is loaded by the spring dand actuated by the distributing cam e acting upon the rollerf mountedat the extremit of the rod. j

ln or er to prevent the rotation of the valve and so that it mayinvariably be con-v trolled under favorable conditions, the roller flodged in the fork-shaped extremity of the hollow rod is arrangedsufficiently far back to insure' that the cheeks q of the fork willconstantly embrace the distributing cam e. The rotation of the rod maylikewise be prevented by prolon ing the journal h of the roller f on oneor oth sides, and-causing it to enter a groove i, shown in Fig. 1a,which is C,flormed in the guide member for the valve ro The spring dacts upon the valve rod by the intern'lediary of a plate lr fixed to theextremity of the part c of the rod. and provided with a passage mestablishing communica-V tion between the chamber of the spring and theinterior of the hollow rod.

Apertures n formed in the hollow rod l) c permit of the lubrication ofthe contact surfaces. A drain orifice o is formed in the part p of thedistributing chest.

Grooves q are formed in the two parts of f the valve rod to provide forlubrication and the formation of a good joint. ln view of the fact thatvalves of this kind are closed by means of springslit is advisable inorder that the distribution maybe effected i as uniformly as possiblethat the strength of j the spring should vary as little as possibleduring the operation of the valve. This result would be attained by theemployment of a s ring of as great av length as possible, but t eemployment of .a long spring frequently presents di'llicultiesespecially when it is not lodged in a part forming one with the` usualparts of the machine.

The hollow rod which forms the object of the .present inventiontherefore resents the advantage that it may be uti ized as the completeor partial housing of'a spring o relatively long, as represented in Fig.3. The two parts s t of the hollow rod situated on each side of thevalve r are preferably of the same diameter. This rod is provided at oneof its extremities with a flange u upon 'which one extremity of a longspring U bears, its other extremity bearing against the cover rr.

In order to prevent the rotation ofthe valve the part s of the rod isprovided at its upper part with a groove y into which a tenon z formingone with the cap or cover :v enters.

The advantages are as follows z--The long bearing surfaces of the valverod rovide a good steam ti ht joint without t e assistance of a stu mgbox, they also provide eiicient guidance for the valve and this A ingchest and from the spring box. These liquids ilow together from thesetwo boxes into a single chamber from which they may be dischargedlubricating the contacting surfaces on their Way.

As regards the construetional form illustrated in Fig. 3 it will be seenthat a spring oft great length and consequently very weak may beemployed very readily without any necessity for providing an externalhousing for this spring. In addition to this, the Walls of the hollowrod at the same time protect the spring from contact with thesuperheated steam. The invention therefore provides a practical solutionof the application of horizontally arranged valve distributing gearsJbecause the relatively large diameter of 'the rod, which does notincrease the weight, creates an extensive bearing surface with verymoderate speciic superficial pressure. The valve itself also becomessmall. As a result of the small weight the inertia effects which areproduced during the movement of the valve likewise assume aminimumvalue, so that the spring d may be of moderate strength and the effortnecessary for contro-lling the valve becomes very small;

By making the portions of valve rods c situated on. diii'erent sides ofthe valve of different diameters, a means-is provided for balancing orloading the valve at will within desiredl limits by means of thepressure of the steam.

The invention is applicable whatever the method of actuating the valverod may be, and also to vertical or inclined rods.

Having. new particularly described and ascertained the nature of oursaid invention and in what manner the same is to be performed, Wedeclare that what we claim is l, The combination with a distributingchest and a multiple seat tubular vali/eef a hollow rod integral withthe valve and having a fork-shaped end, said rod being distributingcamengaging the roller, a plate at the other extremity of the rod, and aspring engaging the plate.

3.x The combination with a multi )le seat tubular valve, of a hollowrod, one o the extremities of said rod being forlvshaped and receiving aroller, a distributing cani engaging the roller, a plate at theotherextreinity or" the rod, and a spring engaging the plate, the platehaving a passage for establishing communication between the chamber of'the spring and the interior of the hollow rod, and the hollow rodapertured for the passage of lubricating materials. 4

4:. The combination with a multi le seat tubular valve, of a hollow rod,one o the extremities of said rod being forlsli.apcd and reeeivingaroller, a distributing cam engaging the roller, a plate at the otherextremity of the rod, and a spring engaging the plate, the plate havinga passage for establishing communication between the chamber el' thespring and the interior 0f the hollow rod', and the hollow rod aperturedfor -the passage of" lubricating materials, and grooves providing forlubrication and the formation of a good joint.

ln testimony whereof we have hereunto set our hands this twenty-eighthday of November, QOG.

HUGO LElvlZ. WILHELM VOl'l. In the presence of two witnesses:

HENRY HASPER, llf'oLDEnL/ln HAUPT.

